/Engine/Plugins/Runtime/Metasound/Source/MetasoundEditor/Public/MetasoundEditorGraphSchema.h
This is used to combine functionality for nodes that can have multiple outputs and should never be directly instantiated.
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)() struct FMetasoundGraphSchemaAction_NodeWithMultipleOutputs : public [FMetasoundGraphSchemaAction](API\Plugins\MetasoundEditor\FMetasoundGraphSchemaAction)